(19)

(11)

EP 2 294 639 A2

(12)

(88) Date of publication A3: 28.01.2010 (43) Date of publication: 16.03.2011 Bulletin 2011/11 (21) Application number: 09750073.0 (22) Date of filing: 19.05.2009

(51) International Patent Classification (IPC):  H01L 51/44(2006.01) (86) International application number: PCT/GB2009/001242 (87) International publication number: WO 2009/141595 (26.11.2009 Gazette 2009/48)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR (30) Priority: 19.05.2008 GB 0809034 (71) Applicant: The University Of Exeter Exeter, Devon EX4 4QJ (GB)	(72) Inventors: ZHU, Yanqiu Nottingham NG7 2RD (GB) ZHAU, Yimin Beijing 100084 (CN) JIA, Yi Beijing 100084 (CN) WEI, Jinquan Beijing 100084 (CN) SHU, Qinke Beijing 100084 (CN) WANG, Kunlin Beijing 100084 (CN) ZHU, Hongwei Beijing 100084 (CN) WU, Dehai Beijing 100084 (CN) (74) Representative: Swindell & Pearson Limited  48 Friar Gate Derby DE1 1GY Derby DE1 1GY (GB)